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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Oct. 04, 2010
Debt Instrument [Line Items]
Revolving credit facility	$ 100,000	$ 100,000	$ 100,000
Debt:
Total debt	27,632	27,632	30,306
Less: current portion	(20,618)	(20,618)	(19,655)
Total long-term debt, net	7,014	7,014	10,651
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 100,000	$ 100,000	100,000
Debt:
Debt interest rate	1.84%	1.84%
Debt, maturity		September - 2019
Senior Notes [Member]
Debt:
Debt interest rate				9.50%
PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt	$ 15,124	$ 15,124	11,249
Debt:
Debt, maturity		Various 2015 and 2016
PST Short-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	19.20%
PST Short-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	14.40%
PST Long-Term Notes [Member]
Debt:
Total long-term debt, net	$ 11,977	$ 11,977	16,770
Debt maturity period range start		2016
Debt maturity period range end		2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	8.00%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	5.50%
Other [Member]
Debt:
Total debt	$ 531	$ 531	837
Suzhou Note [Member]
Debt Instrument [Line Items]
Short-term debt			$ 1,450
Debt:
Debt, maturity		April 2015

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Latest period the outstanding debt instruments are required to be repaid.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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